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Re: Magnifier conversion



Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz <teslalist-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>

Tesla list wrote:

 > Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>

 > We ran the magnifier conversion tonight.  The arc length of the magnifier
 > was about 80% of the two coil setup.  There was a lot of corona, some odd
 > safety gap behavior, and I have no idea what the quenching was doing.  So,
 > this should be considered as preliminary.

Did you try to operate the system without C2? My system falls in a
mode that, in a low-power test, produces almost the same peak output
voltage (smller). Add high-voltage losses in C2 and poor quenching, and
this explains the better performance in this way.

 > We then put in the magnifier stuff.  Primary to secondary arcing was a
 > problem so we wrapped a whole package of poly sheeting around it almost an
 > inch thick.  That stopped the arcing but there was still some low power
 > sparking and corona going on.  Also had a lot of glow around the secondary
 > to extra coil wire.  But basically it was working.

A solenoidal primary appears then to be a serious problem. My system
uses a flat primary and a short solenoidal secondary, and don't
have insulation problems in the driver. The coupling for mode 3:4:5
is only 0.35, but by increasing the diameter of the coils it is possible
to achieve higher coupling without insulation problems.

 > The safety gaps sometimes fired as expected, but they often had some far
 > lower power arcing going on continuously too.  Not sure what that was 
about...

Maybe consequence of no quenching?

 > The tuning for best arcs was right where it should have been and the power
 > conversion was just right (full power on the variac just barely fired the
 > safety gaps).  The C2 capacitor worked perfectly with no problems at all.

Good to see that the capacitor worked.

 > So things seemed to work well but no great performance gain was
 > observed.  I still need to go check all kinds of things however.  Probably
 > more questions than answers tonight...  But as usual, great fun was had!!

The problem is probably poor quenching, or losses in the insufficient
insulation between primary and secondary. Since the two coils system was
already quite efficient, any loss in the three coils system makes a
possible small advantage disappear.

Antonio Carlos M. de Queiroz